Stelmi Italia S.p.A.

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An exclusive chromium plating process

STELMI process easily meets the most severe environmental control requirements.
The conventional plating processes require complex and expensive control equipment and offer limited security even if operated with the best attention.

  • ZERO environment pollution link
  • Stelmi's chromium baths are closed loop and work slightly under the atmospheric pressure: the vapours are continuously collected and treated with both dry and wet scrubbers, recycling the condensation into the baths.
    The impact on the environment is practically reduced to nothing, inside and outside the workshop. There is no risk of leaks of liquid solution

  • NO solid wastes link
  • The only solid wastes resulting from the process is the mud generated from the physical and chemical treatment of the waters: its volume is reduced to about 5% of those generated treating the waters of an equivalent conventional plating plant.

  • LOW chromium solution volume link
  • Stelmi continuous plating technology requires a low chromium solution volume (approx. one tenth of the conventional bath plating equipment) simplifying the chemical content control, ensuring a constant plating performance and product quality.

  • Homogeneous chrome layer link
  • A continuous and automatic monitoring of the characteristics of the chromium bath guarantees a chromium layer that is completely homogeneous.

  • Less power installed link
  • The Stelmi process helps to save energy. The Stelmi process demands far less electrical power than conventional plating.

It also offers safety advantages for the operators in the shop. The equipment is designed according to the highest safety criterion; automation is used everywhere possible.
There are no pits, racks, below ground tanks or confined spaces.

Stelmi core

The STELMI hard chromium plating process is a continuous horizontal operation: The bars advance and rotate, driven one by one through the chromium plating machine using a hydraulic system which also transfers the required electric contact to each bar. The ground and polished bars enter the machine from one side and exit, fully plated, from the other. The bars are fully plated up to the ends, contrary to the conventional processes.

Schema del processo di cromatura

Process diagram

1) waiting bars
2) loading bench
3) cathode contacts
4) rectifier
5) chromium plating unit
6) unloading bench


In the conventional plating methods, the chromium plating operation takes place on stationary bars; the dipping rack carrying the bars is submerged in the bath, horizontally or vertically, for a period of time. The bars are mechanically and electrically fixed to the rack which is connected to the cathode.
The anodes are placed on the long side of the tank; there is no way to create an electric field concentric to the bars and this leads to thickness variations in the chromium overlay. In the Stelmi process the chromium plating is done with a circular anode, and the bar advances and rotates through the anode, so that a completely homogeneous chrome layer is guaranteed.

Stelmi core

the range

Since 2001 Stelmi is world leader in corrosion resistence of its chrome bars and tubes.

The HIPERCHROMIUM technology has established new standards in the fluidpower industry:

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200, 500 and 1000 hours of corrosion resistance in Neutral Salt Spray test ( in compliance with ISO 9227 standard) with a minimum rating ) ( according to ISO 10289 standard). A technological milestone than many companes still try to reach.
Thousands tests in our quality laboratory confirmed by indipendent laboratories and by the most prestigious Customers around the world proved the reliability of this technology.

The HIPERCHROMIUM TECHNOLOGY is fully developed in our R&R Department: more than 35 years of technological know-how, proudly MADE IN ITALY.

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